# SUMMIT PARTNERS L P: Form 13F holdings

An institutional investment manager in BOSTON, MA. SEC CIK 830588.

- Quarter ended: 2026-06-30
- Filed: 2026-07-30
- Reported value: $608.9m
- Positions: 5 (5 lines in the filing's table; lines for the same security and option type are added together here)
- Compared with: the 13F for the quarter ended 2026-03-31
- Filing: https://www.sec.gov/Archives/edgar/data/830588/000117266126002948/

## Holdings

As filed, largest first. Reported value is what the manager stated at the quarter end (Jun 30, 2026), in US dollars; it is filing data, not a price. Weight is the share of the total reported value.

| Issuer | Class | Reported value | Weight | Shares | Put or call | Change on the quarter before |
| --- | --- | ---: | ---: | ---: | --- | --- |
| [KLAVIYO INC (KVYO)](/companies/kvyo.md) | COM SER A | $284.7m | 46.8% | 18,852,778 |  | Unchanged |
| [LIFESTANCE HEALTH GROUP INC (LFST)](/companies/lfst.md) | COM | $249.7m | 41.0% | 23,310,115 |  | Reduced −5,899,661 |
| [A K A BRANDS HLDG CORP (AKA)](/companies/aka.md) | COM SHS | $64.8m | 10.6% | 6,053,693 |  | Unchanged |
| [A10 NETWORKS INC (ATEN)](/companies/aten.md) | COM | $7.5m | 1.2% | 200,065 |  | Unchanged |
| [MACOM TECH SOLUTIONS HLDGS I (MTSI)](/companies/mtsi.md) | COM | $2.3m | 0.4% | 6,005 |  | Reduced −43,268 |

## Sold out

Held at the end of the quarter before and not reported this quarter.

| Issuer | Class | Reported value | Weight | Shares | Put or call | Change on the quarter before |
| --- | --- | ---: | ---: | ---: | --- | --- |
| [AVEANNA HEALTHCARE HLDGS INC (AVAH)](/companies/avah.md) | COM | $0 | 0.0% | 0 |  | Sold out −5,451,422 |
| [SOLO BRANDS INC (SBDS)](/companies/sbds.md) | COM CL A NEW | $0 | 0.0% | 0 |  | Sold out −1,100,870 |

Source: SEC EDGAR, Form 13F-HR, accession 0001172661-26-002948. Last ingested by Listed: Oct 22, 2026, 05:26 ET. No prices; not investment advice.